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redfat_linux.c
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redfat_linux.c
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/*
*
* _|_|_| _| _|_|_|_| _|
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* _|_|_| _|_|_|_| _| _| _|_|_| _| _| _|
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*
* Gregory J. Duck.
*
* Copyright (c) 2022 The National University of Singapore.
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
extern REDFAT_NOINLINE const char *redfat_color_escape_code(FILE *stream,
bool red)
{
// Simply assumes ANSI compatible terminal rather than create ncurses
// dependency. Who still uses non-ANSI terminals anyway?
int err = errno;
int r = isatty(fileno(stream));
errno = err;
if (!r)
return "";
else
return (red? "\33[31m": "\33[0m");
}
static void redfat_random_page(void *buf)
{
int r = syscall(SYS_getrandom, buf, REDFAT_PAGE_SIZE, 0);
if (r != REDFAT_PAGE_SIZE)
redfat_error("failed to get %zu random bytes", REDFAT_PAGE_SIZE);
}
#include <execinfo.h>
static REDFAT_NOINLINE void redfat_backtrace(void)
{
size_t MAX_TRACE = 256;
void *trace[MAX_TRACE];
int len = backtrace(trace, sizeof(trace) / sizeof(void *));
char **trace_strs = backtrace_symbols(trace, len);
for (int i = 0; i < len; i++)
fprintf(stderr, "%d: %s\n", i, trace_strs[i]);
if (len == 0 || len == sizeof(trace) / sizeof(void *))
fprintf(stderr, "...\n");
}